Decentralized and distributed control
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1 Decentralized and distributed control Introduction M. Farina 1 G. Ferrari Trecate 2 1 Dipartimento di Elettronica, Informazione e Bioingegneria (DEIB) Politecnico di Milano, Italy farina@elet.polimi.it 2 Dipartimento di Ingegneria Industriale e dell Informazione (DIII) Università degli Studi di Pavia, Italy giancarlo.ferrari@unipv.it EECI-HYCON2 Graduate School on Control 2015 Supélec, France Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
2 Outline 1 Course information and scheduling Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
3 Outline 1 Course information and scheduling 2 Control of large-scale systems Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
4 Outline 1 Course information and scheduling 2 Control of large-scale systems 3 Decentralized and distributed control: motivating examples Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
5 Outline 1 Course information and scheduling 2 Control of large-scale systems 3 Decentralized and distributed control: motivating examples 4 Course description Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
6 Course information European Embedded Control Institute Lightweight association based on volunteer work created in 2006 in the framework of the HYCON network of excellence. Supported until 2014 by the network of excellence HYCON2 Highly-complex and networked control systems Mission: to become a long-term world-wide renowned focal point by stimulating new collaborative research on networked and embedded control Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
7 Course information European Embedded Control Institute Lightweight association based on volunteer work created in 2006 in the framework of the HYCON network of excellence. Supported until 2014 by the network of excellence HYCON2 Highly-complex and networked control systems Mission: to become a long-term world-wide renowned focal point by stimulating new collaborative research on networked and embedded control Members: about 20 european universities and research centers Education: since 2007 EECI organizes each year the International Graduate School on Control Several modules on many different topics in control theory Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
8 Course information Course on decentralized and distributed control Module M5 of the International Graduate School on Control 2015 Eligible for 2nd Year Master Degree credits and Scientific Thesis modules Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
9 Course information Course on decentralized and distributed control Module M5 of the International Graduate School on Control 2015 Eligible for 2nd Year Master Degree credits and Scientific Thesis modules Exam for getting 3 ECTS The exam will take place on Friday at 13:00. How it works: A set of papers has been distributed to students that will take the exam Each student picks 1 paper and presents it in 20 min. No constraints on the presentation style and no need of professional presentations! Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
10 Schedule of the course Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
11 Course information Entry requirements State-space approach to system and control theory for linear systems Course material Recommended books: J. Lunze. Feedback control of large scale systems. Upper Saddle River, NJ, USA: Prentice Hall, Systems and Control Engineering, D.D. Šiljak. Decentralized control of complex systems. Mathematics in Science and engineering, vol. 184, Academic Press, J. B. Rawlings and D. Q. Mayne. Model predictive control: theory and design. Nob Hill Pub., Madison, WI, USA, J. M. Maestre and R.R. Negenborn (editors). Distributed predictive control made easy. Springer, Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
12 Course information Entry requirements State-space approach to system and control theory for linear systems Course material Recommended books: J. Lunze. Feedback control of large scale systems. Upper Saddle River, NJ, USA: Prentice Hall, Systems and Control Engineering, D.D. Šiljak. Decentralized control of complex systems. Mathematics in Science and engineering, vol. 184, Academic Press, J. B. Rawlings and D. Q. Mayne. Model predictive control: theory and design. Nob Hill Pub., Madison, WI, USA, J. M. Maestre and R.R. Negenborn (editors). Distributed predictive control made easy. Springer, Pointers to specific papers will be provided during the course. An updated version of the slides will be available at the webpage EECI_DEDICO.php Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
13 Control of large-scale systems Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
14 Centralized control Feedback control of Multi-Input Multi-Output (MIMO) systems C u y u: control variables System y: outputs possible external setpoints Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
15 Centralized control Feedback control of Multi-Input Multi-Output (MIMO) systems C u y u: control variables System y: outputs possible external setpoints Pros Simple conceptual framework: one system, one controller Studied for decades. Many controller design procedures available for linear systems Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
16 Centralized control Feedback control of Multi-Input Multi-Output (MIMO) systems Cons C u y u: control variables System y: outputs possible external setpoints Pitfalls for large-scale systems (many inputs, states and outputs) Offline design: model-based controller synthesis can be prohibitive if the system model is huge and system structure is not exploited Real-Time (RT) operations: in a sampling interval Transmission of system measurements to an unique controller might be challenging for systems deployed over a wide area Computation of the control variables might become unfeasible Centralized control might be also unappealing for economical, political or societal reasons Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
17 Decentralized control Decentralized regulators for MIMO systems C 1 C 2 C 3 y 1 y 2 u 1 u 2 u 3 System y 3 Controllers attached to input/output channels Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
18 Decentralized control Decentralized regulators for MIMO systems C 1 C 2 C 3 y 1 y 2 u 1 u 2 u 3 System y 3 Controllers attached to input/output channels Pros Advantages in RT operations: Parallel computation of control variables Easier communication if controllers, sensors and acutators are collocated Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
19 Decentralized control Decentralized regulators for MIMO systems C 1 C 2 C 3 y 1 y 2 u 1 u 2 u 3 System y 3 Controllers attached to input/output channels Cons Absence of communication between controllers limits the achievable performance Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
20 Distributed control Distributed regulators for MIMO systems C 1 C 2 C 3 y 1 y 2 u 1 u 2 u 3 System y 3 Controllers attached to input/output channels (as in decentralized schemes) Controllers can communicate Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
21 Distributed control Distributed regulators for MIMO systems C 1 C 2 C 3 y 1 y 2 u 1 u 2 u 3 System y 3 Controllers attached to input/output channels (as in decentralized schemes) Controllers can communicate Pros Advantages in RT operations: Parallel computation of control variables One can tune the trade-off between communication burden and performance Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
22 Distributed control Distributed regulators for MIMO systems C 1 C 2 C 3 y 1 y 2 u 1 u 2 u 3 System y 3 Controllers attached to input/output channels (as in decentralized schemes) Controllers can communicate Remarks on distributed control Middle ground between centralized and decentralized schemes Communication network can be part of the design problem Challenges due to network non idealties (delays, packet drops etc...) Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
23 Decentralized and distributed control De/Di regulators C 1 C 2 C 3 y 1 y 2 y 3 C 1 C 2 C 3 u 1 u 2 u 3 System y 1 y 2 u 1 u 2 u 3 System Historical remarks Decentralized control has been studied since the 70 s, mainly for linear and unconstrained systems Recent renowned interest triggered by advances in technology and telecommunications sensor networks that enable the monitoring and control of processes spread over large geographical areas smart actuators with onboard communication and computation capabilities Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29 y 3
24 Exploiting system structure Graph of N dynamically coupled systems u1 1 x 1 u 2 2 x 2 u 3 x 3 3 Subsystems with their own inputs u i, states x i and outputs Bold arrows represent physical coupling and define the coupling graph edge (j, i) iff x j influences Σ i Set of neighbors to subsystem Σ i N i = {j : (j, i) is an edge of the coupling graph} In the above example: N 3 = {1, 2} Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
25 Exploiting system structure Graph of N dynamically coupled systems u1 1 x 1 Sometimes subsystems are naturally defined u 3 x 3 3 u 2 2 x 2 Temperature control in buildings subsystems: rooms or thermal zones coupling: heat transfer actuators: radiators/chillers Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
26 Exploiting system structure Graph of N dynamically coupled systems u1 1 x 1 u 2 2 x 2 u 3 x 3 3 More often there are degrees of freedom in decomposing a large-scale MIMO system into a set of physically coupled subsystems Remarks on decomposition Guideline: define subsystems that are loosely coupled Ideal case for controller design: totally decoupled subsystems Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
27 Exploiting system structure De/Di regulators C 1 C 1 u 1 x x 2 C 3 u 3 x 3 3 u 1 x 1 1 u 2 2 x 2 C 3 u 3 x 3 3 u 2 C 2 C 2 Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
28 Design issues Decentralized synthesis of De/Di regulators C 1 u 1 x x 2 u 2 C 2 C 3 u 3 x 3 3 How difficult is the offline design of a single controller? Centralized synthesis: some design steps require the model of the whole plant Decentralized synthesis: controllers can be designed independently using a partial model of the system Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
29 Design issues Decentralized synthesis of De/Di regulators C 1 u 1 x x 2 u 2 C 2 C 3 u 3 x 3 3 How difficult is the offline design of a single controller? Centralized synthesis: some design steps require the model of the whole plant Decentralized synthesis: controllers can be designed independently using a partial model of the system Pure decentralized synthesis guaranteeing stability is not always possible Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
30 Decentralized and distributed control: motivating examples Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
31 Frequency control in power network Power network model P L,1 P ref,1 1! 1 P L,3 P ref,3 3! 3 P ref,2 P L,2 2! 2 Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
32 Frequency control in power network Power network model P L,1 P ref,1 1! 1 P L,3 P ref,3 3! 3 P ref,2 P L,2 2! 2 Σ i : power generation area equipped with primary load frequency control. Linearized model with input ΔPref,i : deviation of reference power from the nominal value output Δω i : deviation of frequency from the nominal value disturbance ΔP L,i : deviations from nominal load Arrows: tie lines Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
33 Frequency control in power network Power network model P L,1 P ref,1 1! 1 P L,3 P ref,3 3! 3 P ref,2 P L,2 2! 2 Goal Design the Automatic Generation Control (AGC) layer for computing ΔP ref,i, i = 1 : 3 using states of the whole network in order to guarantee that Δω i 0 as t + for step loads ΔP L,i. Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
34 Frequency control in power network Power network model P L,1 P ref,1 1! 1 P L,3 P ref,3 3! 3 P ref,2 P L,2 2! 2 Pitfalls of a centralized controller Not scalable with the number of areas Not compatible with different regulation authorities A fault in the controller might compromise the whole network stability Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
35 Frequency control in power network Case study: 4-area network PL,2 Pref,2 2!2 PL,3 Pref,3!3 3 Realistic parameter values from (Saadat, 2002) Σ i is a 4-th order LTI model PL,1 PL,4 Pref,1!1 1 Pref,4 4!4 Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
36 Frequency control in power network Case study - Decentralized control P L,2 2! 2 P L,3 P ref,2 C 2 C 3 P ref,3! 3 3 C 1 P L,1 P ref,1 1! 1 C 4 P L,4 P ref,4 4! 4 Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
37 Frequency control in power network Case study - Decentralized control PL,2 PL,3 C2 Pref,2 2!2 C3 Pref,3!3 3 PL,1 PL,4 C1 Pref,1!1 1 C4 Pref,4 4!4 Simulation results 0.2 Area Area 2 Area 1 x Area 2 x P ref P ref Area Area 4 Area 3 x Area 4 x P ref P ref t [s] t [s] P ref,i for centralized and decentralized control t [s] t [s]! i for centralized and decentralized control Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
38 Ramp metering in motorways Intelligent transportation systems Goal: advanced traffic management for improving driver satisfaction and safety minimize time spent in queues, congestion and pollution Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
39 Ramp metering in motorways Intelligent transportation systems Goal: advanced traffic management for improving driver satisfaction and safety minimize time spent in queues, congestion and pollution Various types of sensors, e.g. wireless magnetometers, for measuring vehicle density Actuators: traffic lights (urban roads) variable speed limits, ramp metering Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
40 Ramp metering in motorways Motorway scheme Motorway model Σ i : blocks of cells with at least an access point inputs: u i [0, 1] metering rates state: density of vehicles u 2 u 1 Goal: minimize total time spent by all vehicles in the motorway or in queues at access points u 3 Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
41 Ramp metering in motorways Motorway scheme u 2 u 1 Pitfalls of centralized control For large number of blocks High computational burden for small sampling times ( 10 s.) Difficult to transmit all measurements to a single location Lack of robustness to controller failure u 3 Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
42 Ramp metering in motorways Motorway scheme Recent results Development of distributed controllers in the EU-FP7 project HYCON 2 u 2 u 1 u 3 Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
43 Course description Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
44 Course description The course will cover basics on 1 Modelling of large-scale systems 2 Stability analysis for large-scale systems 3 Design of decentralized and distributed controllers for 3.1 unconstrained systems 3.2 constrained systems Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
45 Course description The course will cover basics on 1 Modelling of large-scale systems 2 Stability analysis for large-scale systems 3 Design of decentralized and distributed controllers for 3.1 unconstrained systems 3.2 constrained systems Goal Provide the necessary background for starting research in the field of De/Di control Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
46 Course description The course will cover basics on 1 Modelling of large-scale systems 2 Stability analysis for large-scale systems 3 Design of decentralized and distributed controllers for 3.1 unconstrained systems 3.2 constrained systems Goal Provide the necessary background for starting research in the field of De/Di control Remarks To keep it simple, most results will be developed for Linear Time-Invariant (LTI) systems We will start with a short review of mutivariable centralized control Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
47 Course description 1. Modelling of large-scale systems Focus on: Different equivalent representations of large-scale systems Decomposition of a model into subsystems input/output pairs subsystems with local states Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
48 Course description 2. Stability analysis for large-scale systems Classic tools for checking stability of LTI systems become computationally prohibitive when applied to large-scale models. As an alternative, approaches based on the analysis of subsystems and the way they are interconnected will be presented. Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
49 Course description 3.1 De/Di controllers for large-scale unconstrained systems A summary of classic results developed in the 70 s and 80 s on system stabilizability and pole placement using decentralized controllers Some methods for the synthesis of De/Di controllers Techniques based on LMIs (Linear Matrix Inequalities) Pole placement through a specific channel Recent approaches to the design of De/Di output feedback controllers Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
50 Course description 3.2 De/Di controllers for large-scale constrained systems Methods based on Model Predictive Control (MPC). Introduction to MPC and dynamic noncooperative games Some De/Di-MPC schemes with stability analysis (2 systems setting) Plug-and-play design of De-MPC regulators Bonus (if time permits) Plug-and-play decentralized control of islanded microgrids Farina, Ferrari Trecate Decentralized and distributed control EECI-HYCON2 School / 29
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